One of the first things that people think of once they think
they're getting bad gas mileage, is buying a new car - not necessarily brand
new - perhaps a more fuel-efficient used one or even a hybrid. But be careful -
you have to do your homework here. Take into account how much you could sell
your existing car for and how much you're going to pay for the new one. It's
important because generally speaking, going this route will normally result in
a net loss - you'll end up losing money unless you keep the new car for 5 years
or more. Better fuel economy will mean that the day-to-day running expenses
will be less once you've got the new car. But think about it - the initial
outlay to swap cars will likely be huge.
So then you're left with the other option - getting better mpg out of your existing car. How can you do this? Here are some tips
1. Your right foot
So simple anyone can do it. If you're caning it away from
the traffic lights, you're wasting petrol and your mpg will be down. If you're
endurance racing at 80mph on the motorway, you're wasting petrol. Here's the
thing - your gas mileage can drop off as much as 15% between driving at or
below 65mph and driving above 65mph. Now I love speed as much as the next person
but you have to be realistic here - do you want better fuel economy or to get
there marginally quicker? I sound like a total wet blanket telling you this of
course, but driving slower absolutely will improve your mpg. Why? Because once
you get over about 65mph, you're using more engine power to overcome drag,
which means consuming more petrol to do it
.
What about when you're not on the motorway? Well consider a little less braking if you can. If you can see the next set of lights ahead of you are red, don't race up to them and come to a complete stop. Try to moderate your speed a little if you can do it safely. If you can get there as they turn green and the traffic in front begins to move, you're doing OK. That's because it takes more energy to get you going from a complete stop than it does from a slow roll. So if you can do this, it will improve your mpg.
What about when you're not on the motorway? Well consider a little less braking if you can. If you can see the next set of lights ahead of you are red, don't race up to them and come to a complete stop. Try to moderate your speed a little if you can do it safely. If you can get there as they turn green and the traffic in front begins to move, you're doing OK. That's because it takes more energy to get you going from a complete stop than it does from a slow roll. So if you can do this, it will improve your mpg.
2. Change octane if you can
Too many people drive around with medium or premium gas in
their tank when they just don't need to. If your owner's manual says
"regular", it means it. Putting mid-grade or premium in is just
wasting money. Why? Unless you have a high-compression engine which could be
prone to detonation (pinking / pinging), you have absolutely no need for
high-octane petrol. The only thing that higher octane gives you is less
probability of detonation. In high-performance cars with high-compression
engines, that means allowing the engine management system to work at peak
efficiency but for probably 75% of you, your car will quite happily run on the
cheapest petrol you can put in it. Not an improvement in fuel economy per se,
but a money saving at least.
3. Use the internet
Again - not so much about improving your mpg as saving
money; no matter where you live, there will be one or more internet sites that
can provide you with petrol prices in your area. Vote with your money. Buy from
the cheap ones, and shun the expensive ones. It's not improving your mpg, but
it is saving you money, and in the long term, that's what counts here. Apathy
in this area is what the petrol companies rely on. To get you going, here's a
couple of examples. US
petrol prices. UK petrol prices. For others, use your favourite
search engine.
4a. Check your tyre pressures
This is a total no-brainer. Check your tyre pressures
regularly - make it part of your sunday routine or something. All motoring
sites and magazines tell you the same thing and that's for a reason. If your
tyre pressures are low, you will be increasing the rolling resistance of the
tyre on the road and that will be robbing your fuel efficiency - your gas
mileage will be down. So make sure they're up to manufacturer recommended
values (at the very least) and watch your mpg get a little better.
4b. Get low rolling-resistance tyres
You might never have considered this, but manufacturers do
make tyres designed for low rolling resistance. This means that there's less
effort required to roll the tyre along the road surface. Less effort means less
load on your engine. Less load means better mpg. When I went for aftermarket
alloy wheels and tyres on my Honda Element, my gas mileage dropped by about
1mpg due simply to the change in tread pattern of the tyres.
5. Get rid of the roof rack
You go biking or skiing at the weekends. Great. When you're
commuting to work, that empty roof rack is adding aerodynamic drag to your car.
More drag means more power to overcome it, which means worse mpg. Take it off
when you're not using it. Same goes for those 'aerodynamic' roof boxes - if
you're not using it, get rid of it. Yes they look aerodynamic but the fact of
the matter is they do induce drag. And to be honest, they look silly. Hey - I
know it means getting up and doing something rather than just routinely getting
in your car and driving off but we're talking about gas mileage here. mpg. Fuel
economy. It's all to do with money. Be lazy? Or save money?
6. Change your air filter
Out of sight, out of mind. I'm guilty of this. Your air
filter is what protects your engine from ingesting all the dust, dirt and crap
in the air. If it's doing its job well, it will clog up, much like the bag of a
vacuum cleaner. Once it clogs up, your engine has a harder time sucking air
through it. To compensate for the reduced airflow, the engine management system
will richen up the mixture, using more petrol to keep the engine running
smoothly. Replace your air filter once a year and you'll guarantee better gas
mileage. So why am I guilty of this? At the time of writing I change the
three-year-old filter in my car and my mpg jumped by 2.5 overnight. On my car
that equated to a 13% improvement for an outlay of $14. Duh! This is one of the
easiest ones to do yourself too. Go out to your local parts store and look
through their catalog to find the right filter (or use any of a myriad of
online retailer who normally have better prices on aftermarket and performance
stuff like K&N air filters). It will normally be a simple matter of some
plastic or metal clips to get the airbox apart and then you can replace the old
duffer with the new hotness.
7. Change your oil and oil filter
Whilst you won't see any massive improvement by changing
your oil and filter, you're ensuring that your engine is keeping its 'fresh
blood'.
8. Get new spark plugs
Spark plugs work in an incredibly hostile environment. If
you've got more than 30,000 miles on yours, change them. Fresh plugs that
aren't covered in carbon desposits will certainly help you in your quest to
become a fuel miser.
9. Ultrasonic cleaning for your fuel injectors
The only surefire way to clean your fuel injectors is to
have them removed and given an ultrasonic bath. This is like those jewellery
cleaners you might have seen. Basically it's a small tub filled with detergent
solution that is hit with ultra high frequency vibrations or sound waves. The
net effect is that any carbon deposits are shaken off the fuel injectors. Clean
injectors give a more even fuel-air mix which results in a more predictable
burn in the cylinder, which will contribute to improved gas mileage. If your
injectors have never been done, or you've got more than 60,000 miles on them,
consider getting the professionally cleaned. It won't be cheap but it's cheaper
than a new car (by a huge margin) and it will help your mpg.
10. Remapping your ECU - chipping and tuning
Expensive one this, but it might be worth investigating. For
the most part, chipping or remapping your engine management computer would
normally be done to improve performance. It is possible however to go the other
way - trade off some performance in exchange for better gas mileage. Not a lot
of places are advertising this yet but as the price of petrol continues to
spiral, I wouldn't be surprised to see this happen. For example, a few tuning
houses in America have seen some interesting results from flashing European
engine maps into US vehicles. It's a bit dodgy because it means those vehicles
won't pass the emissions tests, but if you're serious, you could get a dual-map
system. For the inspection and emissions, leave it in "US" mode. For
everyday driving, use the European map. Of course you didn't get that idea from
here.
What does all this add up to?
Realistically, if you religiously stick to the
above points (from a regime of previously doing nothing special), you should
expect to see an mpg improvement of about 15%. Doesn't sound like a lot? Let me
put a number on it. Last year I spent around $2600 on petrol throughout the
year. A 15% improvement in gas mileage correlates to a 15% decrease in outlay to
fill my car. In my case about $400 a year. How useful is that? It's a round
trip to Vegas (no hotel). 6 months car insurance. 5 weeks grocery shopping. And
so on and so on. So you can keep wasting money if you like, but if you're
serious about getting better gas mileage, these simple steps really will help.Happy motoring, and I hope you see some improvements in your fuel economy.
Oh - and if you're interested, send me your ideas. After my initial blog post, I had some good ones
Carbible.com
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